Marion Ross

NBC's Up All Night has just hired another Happy Days veteran. Following the casting of Henry "The Fonz" Winkler as Ava's (Maya Rudolph) dad, Marion "Mrs. C." Ross will play Chris's (Will Arnett) Grammy.

Marion's grandma character is described to me as "a brittle, bitter woman who's not too fond of Reagan [Christina Applegate]." The character will debut on the season finale, titled "The Proposals." 

Marion, 83, has also played grandmother roles on Brothers & Sisters and That '70s Show.

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